Traveling grizzly



C. Nl. AVERY.

TRAVELING GRIZZLY.

. APPLICATION FILED Dac. II, 19'20.

Patented Deo. 27

/I. DAI" COLBY M. AVERY, OF AURORA, ILLINOIS, ASSIGNOR '1"0-S'IEI'HENS-ADAMI'SONv MFG;

CO., A CORPORATION OF ILLINOIS. v'

TRAVELING. eRIzzLY.

Specification of Letters Patent. Patented Dec. 27, 1921.'-

Application IedDecember 11, 1920. Serial No. 429,958.'

To all who/m, t may concern.'

Be it known that I, COLBY M. AVERY, a citizen of the United States, and resident of Aurora, county of Kane, and State of Illinois, have invented certain new and useful Improvements in Traveling Grizzlies, of which the following is a specification and which are illustrated in the accompanying drawings, forming a part thereof. l

The invention relates -tothat form of screening devices known in the trade a's the grizzly, in which the screening bed is formed of a plurality of parallel bars. More j specifically, it relates to such devices hav# ing a traveling bed, the bars being c arried by a pair of sprocket chains, or the like. In use the material to be screened, such as coal or rock, is discharged upon. the screen bed, which is of sufficient length to insure the separation out of all of the finer par* ticles.

The object of the present invention is to provide for the agitation of the material as it is carried along by the screen, thereby facilitating the separating out of the finer portions and not only insuring a more complete screening action but also accomplishingJ it with a machine of less length than has heretofore been necessary. This object is attained by an apparatus such -as is hereinafter described and as illustrated in the accompanying drawings, in which- Figure 1 is a side elevation of the device, some portions being broken away; and

Fig. 2 is a transverse vertical section onv the line 2-2 of Fig. 1.

The frame of the apparatus comprises a pair of beams V10, 11, resting upon and tied together at their ends by transverse bars 12, and a 'series of instanding track-supporting brackets, as 13, mounted upon the beams. At each end of the frame there is mounted, in suitable journal boxes, a shaft 14, .15, each shaft carrying a pairof sprocket wheels adjacent its end, as 16, 17. The shaft, as 15, at one end of the apparatus, preferably thedelivery end, is carried by adjustable bearing boxes 18, controlled by adjusting screws 19 mounted in suitable brackets, as 20.

A. pair of sprocket chains 21, 22, are carried by the wheels 16, 17, the screening bars 23 constituting the pivots for the chain links. Each of the sprocket chains comprises a double set of links between which, upon each of the bars 23, is mounted a roller 24, adapted to run upon the tracks provided for both stretches ofthe chains.

The upper track,niountedupon the brackets 13, presentstov lthe rollers 24 an uneven f surface. This trackis comprised of a plu- G0 rality of sections 25, 26,' each Vsection:having an `upwardly .inclined portion 27 and a downwardly inclined portion 28, the latter being preferably more sharplyinclined than the former. Astl'iascreening bed is ad- 65 vancedfin the direction of the arrow of. Fig. 1, its bars are gradually raised by the `inclined portions 27 of the track, and atthey end of these sections drop somewhat suddenly as the Y rollers 24, move vdown the sharperinclines 28.,V I. ;l #j A By 'reason of this undulating movement of thegscreening bed the mass of material carried by itis sufficiently agitated or' worked to free the finer particles and permit them toV escape through the screen, and a complete screening action may .thus vbe se cured by fa screen of much less length than has heretofore been required. l Y

Preferably each bar 23 carries a sleeve 29, 80 the surface of which may be'hardened for durability. These sleeves being looseupon the bars are turned in service sufficiently to insure the presentation of their entire 'pe-` ripheries to the mass of material with substantial uniformity. Thescreening bed isv driven by any suitable means, power being conveniently applied to the shaft 14.`

Other details of the apparatus common to y devices of this character are the shield plates 30, 31, above the screening bed for preventing the escape laterally of material carried thereby, and similar plates 32, 33, above the return stretches of the sprocket chains. The upper or outerk margins, as 34, of the links ofthe sprocket chains are preferably extended somewhat in order that they may. be overlapped by the shield plates 30, 31.

It is desirable, also, track undulations and of the sprocket chains be differentiated. For example, as the machine hasbeen designed the pitch of each track. undulation, that is to say, the length of a straight line from the bottom of one 1,05 depression to the next, is twenty-fourl inches, while the pitch of the sprocket is nine inches. Allowing for the deflectionV of the sprocket chains' from a straight line as Y they travel over'the track, thedistance be- 110 that the pitch vor the 10ov tween centers of three links, in a straight line, is slightly more than twenty-four inches. VArs, a result of this arrangement rollers passing` from the apex ot' adjacent undulations do not exactly coincide, and the material is thereby given a greater agitating movement than would otherwise occur. Y

The purpose of providing the adjusting means is to secure just enough slack in the upper run or stretch of the screen to permit the rollers to constantly ride on the tracln While la preferred and operative form or construction is disclosed, various changes of detail may be made without departing from the scope of the invention.

l claim as my inventionl. ln a traveling, grizzly, in combination, two pairs of sprocket wheels, sprocket chains running upon the wheels, screening bars carried by the chains, and undulating tracks supportingthe chains intermediate of the wheels, the pitch of the undulations of the track and of the sprocket chains be-v ing different and beingso diierentiated that neither is a multiple of the other.

2. In a traveling grizzly, in combination,

sprocket wheels, parallel chains running on the wheels, parallel screening` bars carried by the chains, rollers mounted upon the bars, and undulating tracks for the rollers, the apices of the undulations being so spaced that the rollers approaching two adjacent apices reach the same out of step.

3.' ln a traveling grizzly, in combination, sprocket wheels, parallel chains running on the wheels, parallel screening bars carried by the chains, rollers mounted upon the bars, and undulating tracks for the rollers,

the apices of the undulations of each track being so spaced that the rollers approaching yany two apices reach the same out of step. y f

v fl. In a traveling grizzly, in combination, sprocket wheels, parallel chains running on the wheels, parallel screening bars carried by the chains, rollers mounted upon ythe bars, andundulating tracks for the rollers, the undulations being arranged in series and so spacedrelative to the distance between rollers that no two rollers occupy corresponding positions with respect to any two undulations in the same series.

COLBY M. AVERY. 

